As has been previously reported by multiple sources, Apple is working to ensure third-quarter delivery of its next iPhone, according to a new report from the Wall Street Journal today.

The new phone will be thinner and lighter than the iPhone 4, with a larger 8-megapixel camera, according to what component suppliers told the Journal. There are even rumors that the new iPhone will operate on baseband chips from Qualcomm, as opposed to the Infineon chips used in the iPhone 4.

A person at one of Apple’s suppliers told the Journal that the company expects to sell 25 million iPhones by the end of the year. “The initial production volume will be a few million units… we were told to ship the components to assembler Hon Hai in August,” the person said.

Apple has already sold 18.6 million iPhones in its second fiscal quarter, double the amount it sold during the same period last year.

The company is expected to unveil the new iPhone at an event in the September timeframe. The company normally devotes at least one press event to its iTunes and iPad products. At last year’s September event, Apple unveiled iTunes 10, a new line of iPods and Apple TV, as well as iOS 4.1 and 4.2 previews.